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Torresol Energy - Reinventing Solar Power
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 Central-tower technology:

Central-tower technology

Torresol Energy has pioneered the application of technological solutions for central tower and heliostat plants such as the high concentration receiver system and high-temperature molten-salt storage system.

How the technology works

In central tower plants, heliostats (flat mirrors) reflect solar radiation onto a receiver located at the top of a tower through which molten nitrate salts flow. The salts are impelled from a ‘cold tank’ to a receiver located at the top of a tower where they are heated to 565ºC. The hot salts then descend to the heat exchanger and generate water vapor.

In surplus-energy conditions, in which the heat radiation received is more than sufficient to cover the turbine's demand, some of the salts are stored in a hot tank, saving the heat to be used when solar radiation is low. The salts transfer the stored heat and continue to generate electrical power.


Gemasolar, Torresol Energy property , is the first commercial plant to generate electricity with solar technology using a central tower receiver, a heliostat field and a molten-salt heat storage system.

This installation has:

  • Power of 19.9 MW
  • More than 2,600 heliostats and a surface area of 195 hectares
  • A molten-salt heat storage tank

The advantages of the molten-salt heat storage tank technology of the Gemasolar plant include the following:

  • Molten-salt storage tanks permit independent electrical generation for up to 15 hours without any solar feed
  • The notable increase in the plant's power efficiency guarantees electrical production for 5,000 hours a year, 1.5 to 2.5 times more than other renewable energies
  • The turbine can be operated at normal capacity when there is loss of or a reduction in solar radiation due to clouds.
 Gemasolar plant:

First commercial-scale plant in the world to apply central tower receiver and molten salt heat storage technology.

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